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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 10 - Gravitation > A tuning fork of frequency 380 Hz is moving towards a wall with a velocity of 4 m/s Then the number of beats heard by a stationary listener between direct and reflected sound will be (velocity of sound in air is 340 m/s)

A tuning fork of frequency 380 Hz is moving towards a wall with a velocity of 4 m/s Then the number of beats heard by a stationary listener between direct and reflected sound will be (velocity of sound in air is 340 m/s)

Energy required to move a body of mass m from an orbit of radius 2R to 3R is (where M= mass of earth R= radius of earth)